Problem 4 (Phase Diagram ) : Magnesium-Lead phase diagram is shown in the figure

Question

Problem 4 (Phase Diagram ) : Magnesium-Lead phase diagram is shown in the figure below: a) Identify the intermetallic solid compound. Provide the composition (in wt% Pb) and range of temperatures in which the compound is formed. b) What is a eutectic reaction? Identify all the eutectic points in the diagram and give the corresponding eutectic composition (CE) and temperature (TE). c) Consider a mixture consisting of 10 wt% Pb at room temperature (T=20 degree C). To what temperature should this mixture be heated to dissolve all the Pb into Mg? a)8090Pb

Explanation / Answer

a)the intermetallic compound in the phase diagram is Mg2Pb

it exists at the composition of 19wt % Mg ,81 wt% Pb

it lies in the range between 00 C to a little over 549.50 C

b)

there are two eutectic reaction here one is

Comp.

Temp.

Type of Reaction

Reaction
(on cooling)

(i)

0wt%Pb

640

Comp.

Temp.

Type of Reaction

Reaction
(on cooling)

(i)

0wt%Pb

640

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